Question

clear perenthesis in distributive property-(-p-5q-10r)

Answer 1

Distributive properties

multiplication over addition/subtraction:
a(b±c) = ab ± ac
negation over addition/subtraction:
-(b+c) = -b - c
-(b-c) = -b + c

So applying the distributive properties of negation over addition/subtraction:

-(-p-5q-10r)
= p+5q+10r